Reading
This will broadly fall into three categories - books about writing what you want to write, books about the subject you want to write, and books of the type you want to write.
When picking the former it's important to choose books by authors with a track record of publication in that genre, in the same way you'd look for this in an MA tutor. Respected editors in the field can also be a good source of advice. This is also true of books in connected subjects, for example books about police procedure written by former policemen.
For the latter, I'd suggest choosing a mix of authors whose work you like, and those whose work if popular but you just can't work out why. For the former, read with an eye to why it works for you; for the latter, with an eye to why it doesn't work for you, but why it might for everyone else.
Do Some Outside Study
There are several websites offering free university-taught courses on creative writing. I particularly like Coursera, although it's difficult not to fall down the rabbit hole as there's a huge variety of courses. Some of the writing courses are more general (plot, character), and some are subject-specific (Writing for Young Readers). All are free if you select the option to audit (so you don't get marked or a certificate of completion). Another good site is FutureLearn, which is also a good source of courses on peripheral subjects (they ran a few on forensics last year).
Most of these courses take several weeks and run at set times, although some can be done at your own pace if you sign up before enrollment closes. There are a few that are self-guided so you can do them when you like.
Invite Guest Speakers
An MA course would likely have guest lecturers and there's no reason this can't be replicated at home. There's a wealth of writing-related podcasts about writing, that can fit in around pretty much anything. For example, commuting to work and doing chores are both activities where it's not possible to read or write (unless you like to dictate). There are also YouTube videos and TED talks that can fit into short lengths of time. There are also audiobooks, if you want to get some of your reading done this way (just be aware that some books are abridged).
Next time, deciding when to do it all.